Display panel

ABSTRACT

A display panel having a first display region and second display region is provided. The display panel includes a sub-pixel array that includes a plurality of sub-pixels in an array and distributed in the first display region and the second display region. A non-light-emitting region in the second display region has a greater light transmittance than a non-light-emitting region in the first display region. Among sub-pixels emitting a same color of the plurality of sub-pixels in the first display region and the second display region, a width-to-length ratio of a driving transistor in the pixel circuit of a sub-pixel in the second display region is greater than a width-to-length ratio of a driving transistor in the pixel circuit of a sub-pixel in the first display region.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/420,551, filed on May 23, 2019, which claims priority to ChinesePatent Application No. 201910036533.8, filed on Jan. 15, 2019. All ofthe afore-mentioned patent applications are hereby incorporated byreference in their entireties.

TECHNICAL FIELD

The present disclosure relates to the field of display technologies, andin particular, to a display panel.

BACKGROUND

With the continuous development of display technologies, consumers'requirements on display panels are continuously increasing, and variouskinds of display panel have emerged and have been rapidly developed,such as liquid crystal display panels, organic light-emitting displaypanels, and the like. On basis of that, new display technologies such as3D display, touch display technologies, curved display, ultra-highresolution display and anti-spy display, continue to be developed tomeet the needs of consumers.

In addition, in recent years, more functions have been integrated intothe display panels, such as fingerprint recognition, light touch, facerecognition, iris recognition, etc. It is necessary for the functionssuch as fingerprint recognition and face recognition that light shouldtransmit through the display panel and irradiate onto a sensing devicemounted at a backlight surface of the display panel, which requires thedisplay panel to have a sufficiently high light transmittance. However,in the current display panels, on the one hand, with an increasingresolution, the sub-pixels are distributed with an increasing density,and the number of pixel circuits is also increased correspondingly. Onthe other hand, transistors in the pixel circuits are formed by a metallayer, which makes the transmitting of light through the display panelharder, thereby reducing the transmittance of the display panel.Therefore, an urgent technical problem to be solved is how to furtherimprove the light transmittance of the display panel under the premiseof a higher resolution of the display panel, for achieving accuratefingerprint recognition and face recognition functions.

SUMMARY

In view of above, the present disclosure provides a display panel withimproved light transmittance of the display panel under the premise of ahigh resolution of the display panel, and thus realizing accuratefingerprint recognition and face recognition functions.

In one aspect, the present disclosure provides a display panel, having afirst display region and a second display region. The display panelincludes a sub-pixel array. The sub-pixel array includes a plurality ofsub-pixels arranged in an array. The plurality of sub-pixels isdistributed in the first display region and the second display region. Alight transmittance of a non-light-emitting region in the second displayregion is greater than a light transmittance of a non-light-emittingregion in the first display region. Among sub-pixels emitting a samecolor of the plurality of sub-pixels in the first display region and thesecond display region, a width-to-length ratio of a driving transistorin a pixel circuit of a sub-pixel in the second display region isgreater than a width-to-length ratio of a driving transistor in a pixelcircuit of a sub-pixel in the first display region.

In another aspect, the present disclosure provides a display panel,having a first display region and a second display region. The displaypanel includes a sub-pixel array. The sub-pixel array includes aplurality of sub-pixels arranged in an array. The plurality ofsub-pixels is distributed in the first display region and the seconddisplay region. A light transmittance of a non-light-emitting region inthe second display region is greater than a light transmittance of anon-light-emitting region in the first display region. At least twosub-pixels of the plurality of sub-pixels distributed in the seconddisplay region share one pixel circuit.

In another aspect, the present disclosure provides a display panel. Thedisplay panel includes a sub-pixel array. The sub-pixel array includes aplurality of sub-pixels arranged in an array; a first display region anda second display region; and gate signal lines and data lines. A lighttransmittance of non-light-emitting region in the second display regionis greater than a light transmittance of a non-light-emitting region inthe first display region. The gate signal lines extend in a firstdirection. The data lines extends in a second direction. The firstdirection intersects with the second direction. In the second displayregion, each of the data lines is connected to one sub-pixel of theplurality of sub-pixels.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic structural diagram of a display panel according toan embodiment of the present disclosure;

FIG. 2 is a schematic diagram showing a sub-pixel aperture ratioaccording to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a sub-pixel according to anembodiment of the present disclosure;

FIG. 4 is a partial schematic diagram of a second display regionaccording to an embodiment of the present disclosure;

FIG. 5 is a partial schematic diagram of a display panel according to anembodiment of the present disclosure;

FIG. 6 is a partial schematic diagram of another display panel accordingto an embodiment of the present disclosure;

FIG. 7 is a partial schematic diagram of still another display panelaccording to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of still another display panel accordingto an embodiment of the present disclosure; and

FIG. 9 is a schematic diagram of a display apparatus according to anembodiment of the present disclosure.

DESCRIPTION OF EMBODIMENTS

In order to explain the above described purposes, features andadvantages of the present disclosure, the present disclosure will beelaborated below in combination of drawings and embodiments.

It should be understood that specific details set forth in the followingdescription aim to facilitate the understanding of the presentdisclosure. The present disclosure can be implemented in a variety ofmanners different from those described herein, and those skilled in theart can make similar development without departing from the scope of thepresent disclosure. Therefore, the present disclosure is not limited tothe specific embodiments disclosed below.

FIG. 1 is a schematic structural diagram of a display panel according toan embodiment of the present disclosure. As shown in FIG. 1 , thedisplay panel 10 includes a sub-pixel array, the sub-pixel arrayincludes a plurality of sub-pixels 101 arranged in an array, and theplurality of sub-pixels 101 is distributed in a first display region 110and a second display region 120 of the display panel 10. Anon-light-emitting region of the second display region 120 has a greaterlight transmittance than a non-light-emitting region of the firstdisplay region 110. A distribution density of sub-pixels 101 in thesecond display region 120 is smaller than a distribution density ofsub-pixels 101 in the first display region 110, and among sub-pixelshaving a same illumination color of the plurality of sub-pixels in thefirst display region 110 and the second display region 120, alight-emitting area of a sub-pixel in the second display region 120 islarger than a light-emitting area of a sub-pixel in the first displayregion 110.

It should be noted that the display panel 10 provided in this embodimentcan be an organic light-emitting display panel including an anode, acathode, and an organic light-emitting layer disposed between the anodeand the cathode. By applying a voltage between the anode and thecathode, carriers can be excited to migrate and act on the organiclight-emitting layer, such that the organic light-emitting layer emitslight. In variations of the present embodiment, the display panel 10 canbe other types of display panel, such as a quantum dot light-emittingdisplay panel, a nano crystal light-emitting display panel, or the like,which will not be further described in detail herein.

In addition, as shown in FIG. 1 , since the distribution density ofsub-pixels in the second display region 120 is relatively lower, adistance between centers of two adjacent sub-pixels in this region isrelatively large, and thus the region between the sub-pixels is ahigh-transmittance region 102. Generally, a face recognition device or afingerprint recognition device can be disposed in the placecorresponding to the high-transmission region 102, so that the facerecognition device or the fingerprint recognition device cansufficiently receive an optical signal, thereby realizing an accurateunlocking function.

In the display panel and display apparatus provided by the presentembodiment, as described above, include the first display region 110 andthe second display region 120. The light transmittance of the seconddisplay region 120 is greater than that of the first display region 110,the distribution density of the sub-pixels in the second display region120 is smaller than the distribution density of the sub-pixels in thefirst display region 110, and among sub-pixels having a sameillumination color in the first display region and the second displayregion, a sub-pixel in the second display region 120 has a largerlight-emitting area than a sub-pixel in the first display region 110.With such configuration, the light transmittance in the second displayregion 120 is increased by reducing the distribution density of thesub-pixels in the second display region 120. However, the reduceddistribution density of the sub-pixels in the second display region 120will result in a decrease in an aperture ratio of the sub-pixels in thesecond display region 120. Therefore, by increasing the light-emittingarea of each sub-pixel in the second display region 120, the firstdisplay region 110 and the second display region 120 tend to have anidentical aperture ratio, thereby ensuring brightness uniformity of thedisplay panel.

According to an embodiment, the non-light-emitting region in the firstdisplay region 110 has a light transmittance of T1, and thenon-light-emitting region in the second display region 120 has a lighttransmittance of T2, where T1 and T2 satisfy: 3≤T2/T1≤50. Since theregion generally used for setting a device such as the fingerprint orface recognition device is only a partial region of the display panel,in order to ensure normal display of the display panel, only a partialregion (the second display region 120) of the display panel is set to bea high-transmittance region, while other regions can still be normaldisplay regions, and when the light transmittance of thehigh-transmittance region satisfies the above ratio, the light can besufficiently transmitted through the high-transmittance region, therebyensuring accurate fingerprint or face recognition function of thedisplay panel.

As shown in FIG. 1 , in an embodiment, the display panel 10 includesgate signal lines 111 extending along a first direction X and data lines112 extending along a second direction Y The first direction Xintersects with the second direction Y The gate signal lines 111 areconnected to a gate driving circuit to provide gate driving signals forthe sub-pixels 101, and the data lines 112 are connected to a drivingchip to provide data signals for the sub-pixels 101. In particular, inthis embodiment, the first direction X is perpendicular to the seconddirection Y.

Further, in the present embodiment, among sub-pixels emitting lighthaving the same color, a width in the first direction X of the sub-pixelin the second display region 120 is R1 times a width in the firstdirection X of the sub-pixel in the first display region 110, and awidth in the second direction Y of the sub-pixel in the second displayregion 120 is R2 times a width in the second direction Y of thesub-pixel in the first display region 110. A ratio of a center-to-centerdistance between two adjacent sub-pixels in the first direction X in thesecond display region 120 to a center-to-center distance between twoadjacent sub-pixels in the first direction X in the first display region110 is R3, and a ratio of a center-to-center distance between twoadjacent sub-pixels in second direction Y in the second display region120 to a center-to-center distance spacing between two adjacentsub-pixels in the second direction Y in the first display region 110 isR4, where 0.8≤(R1×R2)/(R3×R4)≤1.2. FIG. 2 is a schematic diagram showinga sub-pixel aperture ratio according to an embodiment of the presentdisclosure. Referring to FIG. 2 , a center-to-center distance betweenadjacent sub-pixels in the first direction X is P1, a center-to-centerdistance between two adjacent sub-pixels in the second direction Y isP2, and thus an area of the dotted region is S=P1×P2. The sub-pixelaperture ratio is a ratio of a total area of sub-pixel regions withinthe dotted region to the area of the dotted region. As described above,for example, the width in the first direction of the sub-pixels in thesecond display region 120 is R1 times the width in the first directionof the sub-pixels in the first display region 110, the width in thesecond direction of the sub-pixels in the second display region 120 isR2 times the width in the second direction of the sub-pixels in thefirst display region 110, and thus the area of the sub-pixel regions inthe dotted region in the second display region 120 is (R1×R2) times thearea of the sub-pixel regions in the dotted region in the first displayregion 110. Further, since P1 in the second display region 120 is R3times P1 in the first display region 110, and P2 in the second displayregion 120 is R4 times P2 in the first display region 110, the area ofthe dotted region in the second display region 120 is (R3×R4) times thearea of the dotted region in the first display region 110, and in thisregard, the aperture ratio of the second display region 120 is[(R1×R2)/(R3×R4)] times the aperture ratio of the first display region110. Therefore, if the first display region 110 and the second displayregion 120 tend to have an identical aperture ratio, the value of[(R1×R2)/(R3×R4)] should approach 1 or be equal to 1. In an embodiment,a range is set, 0.8≤(R1×R2)/(R3×R4)≤1.2. Within this range, the apertureratios the first display region 110 and the second display region 120tend to be uniform, so that the overall brightness of the display panelis uniform.

The above embodiments are described based on a situation where the areamagnification of the second display region 120 and the first displayregion 110 is identical for sub-pixels of all colors. Alternatively, insome other embodiments, the sub-pixels have different areamagnifications according to different colors.

In an embodiment, the display panel 10 at least includes red sub-pixels,green sub-pixels, and blue sub-pixels. A ratio of a light-emitting areaof the green sub-pixels in the second display region 120 to alight-emitting area of the green sub-pixels in the first display region110 is smaller than a ratio of a light-emitting area of the redsub-pixels in the second display region 120 to a light-emitting area ofthe red sub-pixels in the first display region 110 and/or a ratio of alight-emitting area of the blue sub-pixels in the second display region120 to a light-emitting area of the blue sub-pixels in the first displayregion 110. The reason is in that, the human eyes have the highestspecific visual perception to the green sub-pixels, and thus the lightloss caused by appropriate reduction of the light-emitting area of thegreen sub-pixels is smaller than the red light and blue light.Generally, in the display panel, the green sub-pixel can meet thedisplay requirement with a relatively small light-emitting area.Therefore, in the present embodiment, in order to further increase thelight transmittance of the second display region 120, the light-emittingarea of the green sub-pixels in the second display region 120 isdesigned to be smaller, which can still ensure the brightness of thesecond display region 120.

FIG. 3 is a schematic structural diagram of a sub-pixel according to anembodiment of the present disclosure. Referring to FIG. 3 , thesub-pixel 101 includes an anode 130 and a pixel circuit 131. In thesecond display region 120, the anode 130 and the pixel circuit 131extend in a same direction, while the anode 130 and the pixel circuit131 overlap each other in a direction perpendicular to a surface of thedisplay panel 10. In such design, in which the anode 130 and the pixelcircuit 131 extend in the same direction and the anode 130 and the pixelcircuit 131 overlap each other, an overlapping degree between the anode130 and the pixel circuit 131 can be as high as possible. Since thepixel circuit is a main structure that affects the light transmittanceof the non-light-emitting area, if the pixel circuit 131 is covered asmuch as possible by the anode 130, the area of the part of the pixelcircuit 131 extending to the non-light-emitting area can be reduced,thereby increasing the light transmittance of the non-light-emittingarea. It should be noted that the said light-emitting area of thesub-pixel 101 tend to be equal to or even is equal to the area of theanode 130. As light emitted by the light-emitting layer is reflected bythe anode 130 and exits from a light-emitting side, the light-emittingarea of the pixel corresponds to the area of the anode. In addition, itshould be noted that the pixel circuit 131 shown in the figure is merelyillustrative, and the pixel circuit 131 usually includes a plurality oftransistors and a capacitor, such as a 6T1C pixel circuit including sixtransistors and one capacitor. The specific structure of the pixelcircuit is not described in detail herein.

In a further embodiment, in the second display region 120, the anode 130completely covers the pixel circuit 131 alone at least one direction ofthe first direction X or the second direction Y For example, when theanode 130 completely covers the pixel circuit 131 in the first directionX, no metal film layer of the pixel circuit is provided between twoadjacent sub-pixels in the first direction X, so that the region betweenadjacent sub-pixels has a relatively high light transmittance. Inparticular, the anode 130 can completely cover the pixel circuit 131 inboth the first direction X and the second direction Y, such that boththe region between adjacent sub-pixels in the first direction X and theregion between adjacent sub-pixels in the second direction Y have arelatively high light transmittance.

In addition, in an embodiment, among sub-pixels of the same color in thefirst display region 110 and the second display region 120, awidth-to-length ratio of a driving transistor in the pixel circuit ofthe sub-pixel in the second display region 120 is greater than awidth-to-length ratio of a driving transistor in the pixel circuit ofthe sub-pixel in the first display region 110. Further, with respect tothe sub-pixels of the same color, the area of the sub-pixel in thesecond display region 120 is larger than the area of the sub-pixel inthe first display region 110, while the distribution density ofsub-pixels in the second display region 120 is smaller than thedistribution density of sub-pixels in the first display region 110. Thedriving capability of the pixel circuit is related to thewidth-to-length ratio of the driving transistor therein. In this regard,if the sub-pixels in the second display region 120 needs to have thesame brightness as the sub-pixels in the first display region 110, thedriving transistor of the pixel circuit corresponding to the sub-pixelin the second display region 120 should have a greater width-to-lengthratio, thereby ensuring brightness uniformity of the sub-pixels in thetwo display regions.

FIG. 4 is a partial schematic diagram of the second display regionaccording to an embodiment of the present disclosure. Referring to FIG.4 , in the second display region 120, at least two adjacent sub-pixels101 share one pixel circuit. With such design, the area of the pixelcircuit can be further reduced, and the light transmittance of thenon-light-emitting region can be further increased.

As described above, the light-emitting area of the sub-pixel 101 in thesecond display region 120 is larger than the light-emitting area of thesub-pixel 101 in the first display region 110, and in this regard, thereare various variations in the specific difference in the light-emittingarea between these two, which will be described in detail in thefollowing embodiments.

In an embodiment, referring to FIG. 5 to FIG. 7 , in the first directionX, a center-to-center distance between two adjacent sub-pixels in thefirst display region 110 is P11, and a center-to-center distance betweentwo adjacent sub-pixels in the second display region 120 is P12, whereP12=R3×P11, and R3≥1.

In the second direction Y, a center-to-center distance between twoadjacent sub-pixels in the first display region 110 is P21, and acenter-to-center distance between two adjacent sub-pixels in the seconddisplay region 120 is P22, where P22=R4×P21, and R4≥1.

FIG. 5 is a partial schematic diagram of a display panel according to anembodiment of the present disclosure. Referring to FIG. 5 , amongsub-pixels of the same color in the first display region 110 and thesecond display region 120, a width in the first direction X of thesub-pixel in the first display region 110 is W1, and a width in thefirst direction X of the sub-pixel in the second display region 120 isW12, where W11 and W12 satisfy: W11=W12; and a width in the seconddirection Y of the sub-pixel in the first display region is W21 and awidth in second direction Y of a sub-pixel in the second display regionis W22, where W21 and W22 satisfy: W22=M1×W21, and M1>1. That is, thesub-pixel in the second display region 120 have only a larger dimensionin the second direction than the sub-pixel of the same color in thefirst display region 110. With such design, the data line 112 extendingin the second direction Y, when extending from the first display region110 to the second display region 120, is not required to be winded orbent, thereby simplifying the manufacturing process.

Further, in an embodiment, M1=4, and R3×R4=4.

According to the above-described calculation of the aperture ratio, whenM1=4 and R3×R4=4, the aperture ratios of the first display region 110and the second display region 120 are identical, which ensures thebrightness uniformity of the display panel. It should be noted that, inother embodiments, M1 and (R3×R4) can be other values, and the apertureratios of the first display region 110 and the second display region 120are identical as long as M1=(R3×R4), thereby ensuring the brightnessuniformity of the display panel. In the present embodiment, thecenter-to-center distance between two adjacent sub-pixels in the firstdirection X in the second display region 120 is larger, and therefore,the fingerprint recognition or face recognition detecting device can beinstalled between two adjacent sub-pixels in the first direction X inthe second display regions 120.

FIG. 6 is a partial schematic diagram of another display panel accordingto an embodiment of the present disclosure. Referring to FIG. 6 , amongsub-pixels having the same color in the first display region 110 and thesecond display region 120, a width in the first direction X of thesub-pixel in the first display region 110 is W1, and a width in thefirst direction X of the sub-pixel in the second display region 120 isW12, where W11 and W12 satisfy: W12=N1×W11 and N1>1; and a width in thesecond direction Y of the sub-pixel in the first display region 110 isW21 and a width in second direction Y of a sub-pixel in the seconddisplay region 120 is W22, where W21 and W22 satisfy: W21=W22. In thiscase, the arrangement of the fingerprint recognition or face recognitiondetecting device can be specifically matched, and such an arrangementcan be selected as needed.

Further, in an embodiment, N1=4, and R3×R4=4.

According to the above-described calculation of the aperture ratio, whenN1=4 and R3×R4=4, the aperture ratios of the first display area 110 andthe second display area 120 are identical, thereby ensuring brightnessuniformity of the display panel. It should be noted that, in otherembodiments, N1 and (R3×R4) can be other values, and the aperture ratiosof the first display area 110 and the second display area 120 will beidentical as long as N1=(R3×R4), thereby ensuring the brightnessuniformity of the display panel. In the present embodiment, thecenter-to-center distance between two adjacent sub-pixels in the seconddirection Y in the second display area 120 is larger, and therefore, thefingerprint recognition or face recognition detecting device can beinstalled between two adjacent sub-pixels in the second direction Y inthe second display region 120.

FIG. 7 is a partial schematic diagram of still another display panelaccording to an embodiment of the present disclosure. Referring to FIG.7 , among sub-pixels having a same illumination color in the firstdisplay region 110 and the second display region 120, a width in thefirst direction X of a sub-pixel in the first display region 110 is W11and a width in the first direction X of a sub-pixel in the seconddisplay region 120 is W12, where W11 and W12 satisfy: W12=M2×W11 andM2>1; and a width in the second direction Y of a sub-pixel in the firstdisplay region 110 is W21 and a width in second direction Y of asub-pixel in the second display region 120 is W22, where W21 and W22satisfy: W21=N2×W22 and N2>1. Under such design, the size of thesub-pixels of the second display area 120 can be freely set, and inpractical use, this type of design can also be selected according to thestructure of the fingerprint recognition or face recognition device.

Further, in an embodiment, M2=2, N2=2, and R3×R4=4.

According to the above-described calculation manner of the apertureratio, when M2=2, N2=2, and R3×R4=4, the aperture ratios of the firstdisplay area 110 and the second display area 120 are identical, therebyensuring the brightness uniformity of the display panel.

In addition, it should be noted that the above embodiments are allillustrated by taking a display panel 10 including red sub-pixels (R),green sub-pixels (G), and blue sub-pixels (B) as an example. However, inother alternative embodiments, the display panel 10 may include four ormore types of sub-pixels, which is not specifically limited herein.

In addition, it should also be noted that, in the above embodiments, thedata lines 112 extend from the first display region 110 to the seconddisplay region 120. Since the number of sub-pixels in the second displayregion 120 is less than that in the first display region 110, only apart of the data lines extends from the first display region 110 to thesecond display region 120, which causes different loads on differentdata lines in the display panel. In order to balance the loads,according to an embodiment, a compensation component is connected to apart of the data lines that do not extends to the second display region120. The compensation component can be a compensation capacitor or acompensation resistor. By providing the compensation component, theloads on the data lines each of which is connected to a relatively smallnumber of sub-pixels can be increased, so that the loads on all the datalines can be balanced, and therefore the brightness of all of theregions of the display panel is uniform.

FIG. 8 is a schematic diagram of a display panel according to anembodiment of the present disclosure. Referring to FIG. 8 , a groove oran excavated structure is provided in a non-display region 140 locatedwithin the second display region 120. At present, the full displayscreen is the mainstream trend in the display industry, and the biggestchallenge currently encountered in the full display screen is thearrangement of the front camera. Generally, a groove or an excavatedstructure is provided at an edge of the full screen for arranging thefront camera. In the present embodiment, the non-display region 140 islocated within the second display region 120, so that the front cameraand the face recognition device can be disposed at a specific place ofthe display screen, and the places of the display screen other than thisspecific place are used for a normal display, thereby improving thedisplay effect and user experience.

In another aspect of the present disclosure, a display apparatusincluding the display panel is provided according to any of the aboveembodiments.

FIG. 9 is a schematic diagram of a display apparatus according to anembodiment of the present disclosure. Referring to FIG. 9 , the displayapparatus 20 includes a display panel 10 described in any of the aboveembodiments. The display apparatus 20 can be a mobile phone, a notebookcomputer, a television, a watch, a smart wearable display apparatus, andthe like, which is not specifically limited herein. In the presentembodiment, a face recognition device is provided in the displayapparatus 20 in a region corresponding to the second display region 120,and configured to receive infrared rays through a light-transmittingregion of the second display region, so as to recognize a human face andachieve the corresponding unlocking function.

In view of the above description, in the display panel and the displayapparatus provided by the present disclosure, the display panel 10includes a first display region 110 and a second display region 120, thelight transmittance of the second display region 120 is greater thanthat of the first display region 110, the distribution density of thesub-pixels in the second display region 120 is smaller than thedistribution density of the sub-pixels in the first display region 110,and among sub-pixels having the same color, the light-emitting area ofthe sub-pixel in the second display region 120 is larger than thelight-emitting area of the sub-pixel in the first display region 110.With such design, on the one hand, the light transmittance in the seconddisplay region 120 is increased by reducing the distribution density ofthe sub-pixels in the second display region 120. On the other hand,since the reduced distribution density of the sub-pixels in the seconddisplay region 120 causes a decrease in the aperture ratio of thesub-pixels in the second display region 120, by increasing thelight-emitting area of each sub-pixel in the second display region 120,the first display region 110 and the second display region 120 tend tohave an identical aperture ratio, thereby ensuring brightness uniformityof the display panel. Since the light transmittance of the seconddisplay region 120 is relatively greater, the face recognition devicecan be disposed at a position corresponding to the position where thelight transmittance is greater, so that the face recognition device cansufficiently receive the light signal, so as to accurately realize theunlock function.

The above is a detailed description of the present disclosure inconnection with the specific preferred embodiments. However, theembodiments of the present disclosure are not limited to the abovedescription. Those skilled in the art can still make variousmodifications or replacements without departing from the concept of thepresent disclosure, and those modifications or replacements shall fallwithin the protection scope of the present disclosure.

What is claimed is:
 1. A display panel having a first display region anda second display region, comprising: a sub-pixel array comprising aplurality of sub-pixels arranged in an array, wherein the plurality ofsub-pixels is distributed in the first display region and the seconddisplay region, wherein a light transmittance of a non-light-emittingregion in the second display region is greater than a lighttransmittance of a non-light-emitting region in the first displayregion, wherein among sub-pixels emitting a same color of the pluralityof sub-pixels in the first display region and the second display region,a width-to-length ratio of a driving transistor in a pixel circuit of asub-pixel in the second display region is greater than a width-to-lengthratio of a driving transistor in a pixel circuit of a sub-pixel in thefirst display region.
 2. The display panel according to claim 1, whereinthe light transmittance of the non-light-emitting region in the firstdisplay region is T1, and the light transmittance of thenon-light-emitting region in the second display region is T2, where T1and T2 satisfy: 3≤T2/T1≤50.
 3. The display panel according to claim 1,further comprising gate signal lines extending in a first direction anddata lines extending in a second direction, the first directionintersecting with the second direction, wherein a distribution densityof sub-pixels in the second display region is smaller than adistribution density of sub-pixels in the first display region, andwherein among sub-pixels emitting the same color of the plurality ofsub-pixels in the first display region and the second display region, alight-emitting area of a sub-pixel in the second display region islarger than a light-emitting area of a sub-pixel in the first displayregion.
 4. The display panel according to claim 3, wherein among thesub-pixels emitting the same color of the plurality of sub-pixels in thefirst display region and the second display region, a width in the firstdirection of a sub-pixel in the second display region is R1 times awidth in the first direction of a sub-pixel in the first display region,and a width in the second direction of a sub-pixel in the second displayregion is R2 times a width in the second direction of a sub-pixel in thefirst display region; and a ratio of a center-to-center distance betweentwo adjacent sub-pixels in the first direction in the second displayregion to a center-to-center distance between two adjacent sub-pixels inthe first direction in the first display region is R3, and a ratio of acenter-to-center distance between two adjacent sub-pixels in the seconddirection in the second display region to a center-to-center distancebetween two adjacent sub-pixels in the second direction in the firstdisplay region is R4, where 0.8≤(R1×R2)/(R3×R4)≤1.2.
 5. The displaypanel according to claim 3, wherein the plurality of sub-pixels at leastcomprises red sub-pixels, green sub-pixels, and blue sub-pixels, whereina ratio of a light-emitting area of a green sub-pixel in the seconddisplay region to a light-emitting area of a green sub-pixel in thefirst display region is smaller than a ratio of a light-emitting area ofa red sub-pixel in the second display region to a light-emitting area ofa red sub-pixel in the first display region and/or a ratio of alight-emitting area of a blue sub-pixel in the second display region toa light-emitting area of a blue sub-pixel in the first display region.6. The display panel according to claim 1, wherein each of the pluralityof sub-pixels comprises an anode and a pixel circuit, wherein for eachof the plurality of sub-pixels in the second display region, the anodeand the pixel circuit extend along a same direction, and in a directionperpendicular to a plane of the display panel, the anode and the pixelcircuit overlap each other.
 7. The display panel according to claim 6,wherein for each of the plurality of sub-pixels in the second displayregion, the anode completely covers the pixel circuit in at least onedirection of the first direction or the second direction.
 8. The displaypanel according to claim 3, wherein a center-to-center distance betweentwo adjacent sub-pixels in the first direction in the first displayregion is P11, and a center-to-center distance between two adjacentsub-pixels in the first direction in the second display region is P12,where P11 and P12 satisfy: P12=R3×P11, and R3≥1; and a center-to-centerdistance between two adjacent sub-pixels in the second direction in thefirst display region is P21, and a center-to-center distance between twoadjacent sub-pixels in the second direction in the second display regionis P22, where P21 and P22 satisfy: P22=R4×P21, and R4≥1.
 9. The displaypanel according to claim 8, wherein among the sub-pixels emitting thesame color of the plurality of sub-pixels in the first display regionand the second display region, a width in the first direction of asub-pixel in the first display region is W1, and a width in the firstdirection of a sub-pixel in the second display region is W12, where W11and W12 satisfy: W12=M2×W11, and M2>1; and a width in the seconddirection of a sub-pixel in the first display region is W21, and a widthin second direction of a sub-pixel in the second display region is W22,where W21 and W22 satisfy: W21=N2×W22, and N2>1.